My brother's 7720 sold on a consignment auction yesterday in Central Iowa for just under $10,000. It is an '82 with 4600 hours in very good condition and very well maintained. 30" tires, chopper and heavy rear axle. At the same auction, he (my brother) bought an early model 920 flex in good shape for $4800 to use on the 9500 he traded his 7720 for. I would guess that his 220 flex (that we will use on my 6620 next year) would be worth around $2500 to $3000 in these parts. Another 7720 with fewer hours sold on farm auction last week in the same area for $7500. Not too sure about the condition of this one but it looked clean. Hope that gives you some useful info.